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TM 5-4210-220-12
Table 4-2. UNIT TROUBLESHOOTING - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1a CAB HEATER LEAKS
Determine location of leak.
Remake connections or replace components as required, (see para. 4-12).
1b CAB HEATER FAILS TO HEAT
Step 1. Core or fan blocked by dirt or litter.
Clean fan housing or heater.
Step 2. Coolant lines blocked.
Replace damaged hose.
Step 3. Heater valve closed.
a. Open heater valve.
b. Replace heater valve or heater valve operating cable, (see para. 4-12).
Step 4. Air lock in heater.
Loosen outlet connection and vent air.
Step 5. Engine not at working temperature.
a. Wait until engine at temperature.
b. Engine thermostat failed, replace thermostat, (see para. 4-28).
Step 6. Blower fan not working.
a. Replace defective switch, wire or circuit breaker.
b. Replace fan motor, or tighten fan blower to motor shaft, (see para. 4-12).
1c CAB DEFROSTER LOUVERS NOT BLOWING
Defroster damper not opening.
Check cable and damper, (see para. 4-12).
4-21
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